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Intensive free-choice and no-choice cohort tests for evaluating resistance to Maruca testulalis (Lepidoptera: Pyralidae) in cowpea

Published online by Cambridge University Press:  10 July 2009

T.N.C. Echendu  and
A.E. Akingbohungbe
T.N.C. Echendu
Affiliation:
National Root Crops Research Institute, Umudike-Umuahia, Nigeria
A.E. Akingbohungbe
Affiliation:
Department of Plant Science, Obafemi Awolowo University, Ile-Ife Nigeria
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Abstract

A method for intensive screening of cowpea for resistance to Maruca testulalis (Geyer) is described. It is capable of ensuring uniform infestation and thus eliminating problems due to escapes. Four cowpea varieties earlier identified from field screening trials as resistant (TVU 946, TVU 1896 AG, H 51–1 and 2 AK) and three susceptible varieties (Ife Brown, H 144–1 and 58–185) were screened using this method. The results confirmed the status of the resistant varieties. Some effects on M. testulalis included, non preference for oviposition and larval feeding, and antibiosis manifested by reduced final larval instar weight, elongated pupal period and smaller sized emerging adult females.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 80 , Issue 3 , September 1990 , pp. 289 - 293
Copyright
Copyright © Cambridge University Press 1990

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